Sex differences among non-brain-damaged adults on the Wechsler Adult Intelligence Scales: a review of the literature.

We reviewed studies of the performance of non-brain-damaged men and women on the Wechsler Adult Intelligence Scales (i.e., the Wechsler-Bellevue, Wechsler Adult Intelligence Scale, and Wechsler Adult Intelligence Scale-Revised) to determine if there were sex differences on specific test items, on specific subtests, or on Verbal IQ, Performance IQ, or the Verbal-Performance Discrepancy score. There were sex differences on some items of each of the three measures, but the number of such differences was small. A number of studies suggested differences on subtests of these scales. A meta-analysis indicated that females tended to outperform males by about a third of a standard deviation on the Digit Symbol subtest, while males tended to outperform females to the same extent or greater on the Arithmetic and Information subtests. Finally, in the few studies on IQ or discrepancy-score differences, there was no evidence of any consistent differences between the sexes in the Verbal-Performance Discrepancy, although there was some tendency for males to obtain higher Verbal IQs. This review, therefore, does not suggest that there are any major differences between non-brain-damaged males and females on the Wechsler adult intelligence scales.